DE1815324C - Hand-held microphone for sound recording and playback devices, especially dictation devices - Google Patents

Description

for ¹ ηπτί £ * '' I ⁶ " ^{1. convention} » es handheld microphone 10

Share SSt ηΓΐ ^ ΐ ^ ¹ «" »electrical parts shown Connections 1 to 7 are the connections via which the hand-held microphone is connected to the eigerS-

d ^! e ^C S ^e Ans ^! cn; ^er f / ^ät ^ ** ^{2) VCrbunden} tKr connection 1 is supplied with an operating voltage

SersVa after the ^{switching position of the control switch is} switched through to one of the 4 connections 2 to 5. The slide switch 8 connect? that of the line 1 in the position - W Vw λ '"' CT ^{Jeni connection} ß 2, in the position SteliuT ^ mT T ^{the connection} 3, in the Ie nnf ^ Ü ^ ^ *** connection 4 and in the position A (recording) with the connection 5. The connection

Wan ^U d ^S l ^S e ^e _r V ^J , ^nd? $ **** ^ electroacoustic ^ n Her FO- ^B · ^ ^micro ° n acts, connected. , "" T ^ ¹ j ^{2 lst "un the} hand microphone 10 with a contactless electronic control unit shown is to fulfill the same functions as de ateuerteil the microphone after fi" 1 The Shah

ttnich ⁸ M ^ U- ^{1 is here d} "-h ⁸ contactless electronic means 12 13, 14 and 15 replaced, which can be built up and at the output contain an electronic switch, which here with the S \ mbol one Switching contact is indicated The line 1 is connected to a metallic covering 11-

SrLt '", if ™ ^, the metal coverings 22, 23, 24 and 25 assigned to ^{the four} different switching positions R, W, H and A are arranged. Any cover 22, 23, 24 or 25 with the main bela * 11

prevent mmln «!. ~: _ x_,. 1 """" O ¹¹

iÄStSfiriSSlAteri? ⁸ ?? 14 or 15, ^{KU0Se gets control means} 12, 13,

If ζ B of the ReIa _n τ> _m - _t α di -, -. , den so telanot «heI H η · ν, '" ¹ ^, ^{ll VeiW} Sd ein teuersiSa, ^ ^Beru . ^hrun f w'derstand der Sl 12 what to fX L Γ? l ^kontak i ^lose tax with-SnlskOTtak J.rul' ^{that the} / l ^ect ™ niche

does dhhh t advise " ¹¹ "? J ^{and dami} * ^for

also applies to dfc
S ducn die

^the « ⁿ J? Pf ^e control means 14 and

If now Hp " _m f 11 · u

p ™ _ne der LVitun, l ^ "h ΐ ° ^B ^ ^g ? ^the pd ^ ong over line 1 to the input of the electronic control means! 13 designed, the associated electronic output contact is closed, ^{and there} & ^1αη & ^a bias voltage over the Series resistor 17 to the base of transistor 16. In the case of a PNP translator 16, this control voltage is negative for the base; it should be positive for an NPN transistor Lines 1 and 3 the AC voltage

source 19 to the electroacoustic converter «8 through.

During the positive half-waves of the alternating voltage source 19, the line 3 connected to the emitter of the Transi- «™ ^{16 is} positive, so that the transistor works in normal operation when switched on. During the positive half-cycle of the AC voltage source 19, however, the Λπ connection 3 is negative, and the transistor 16 can ^{only then be kept in the} conductive state.

^{when the base ne} g ^{ativer Ais the INTR} S ³ "t For this reason, the negative control voltage for ^{the Babii} must have ^a certain minimum value, which ^{is higher than the maximum} occurring negative voltage peaks of the AC voltage 19. I _n the

_a5 negative half-waves of the alternating voltage source "the transistor 16 works in inverse operation. It must also be taken into account here that an asymmetrical transistor has ^a lower current gain in inverse operation than in the case of inverse operation.

has normal operation.

^{In this way it is thus possible to b Lich} 8 'Change clamping ^{nUngSsi f e,} durchzuschilten relatively high power to an electro-acoustic transducer 18, which may be, for example, a playback ^speaker!,

" ^{without the need for} metallic contacts

Ren. With sufficiently high control signals at the base

of transistor 16, the distortion and

Losses can be kept negligibly low.

^{It is of} course also possible to have several

to equip these contactless electronic means 12 to 15 ^{with an} additional transistor for switching through alternating voltages; Under ^{certain circumstances, it may be} useful to provide corresponding additional transistors 16 for all channels ^{. With the} control channel connected to line 3, direct ^{voltages can of} course also be switched.

1 sheet of drawings

Claims (2)

1 O 2 niche switches to influence. At the end of these patent claims: contactless electronic control means is an electronic switch in almost all cases. 1. Hand microphone for sound recording and the one that replaces the original fischen'Stoierkon playback devices, especially dictation devices, 5-tact. The electrical properties are so cner with a control part, which, as a replacement for metal control parts in hand-held microphones, preferably see control contacts, over contact-free electronics designed that it is against ^M ™phia "^ see means several control functions in the main control contacts without able to effect further exchanged device, for example the functions can be. Record, play, rewind and hold, i. Often, however, there is a need to mn the mechanical control contacts must be switched through in one of these positions AC voltages in the hand microphone, z. B. the low AC voltage "", z. B. low-frequency voltage signals to an electroacoustic gene, to be switched through directly The previously known converter in the playback position, characterized by contactless electronic control means in Hanann, that for switching t ₅ microphones were only used to switch G. p.ichder alternating spa-iungen (19> the collector -Emit- voltages designed, provided for alternating voltages, eter path of a transistor (16), but not suitable. For this reason, it had to _; as far as is conductive controllable, which in turn with its metallic condass it can switch through the voltage in the normal as well as in the inverse clocking.
Operation of the highest alternating voltage occurring. The invention is based on the object of being able to switch through the voltage peaks without being blocked without the principle of fully electronic contactless control. the functions in sound recording and playback 2. Hand-held microphone according to claim 1, which gave advice. In particular dictation machines, also characterized in that the base of the transistor a ₅ supports the switching of alternating voltages- (16) from the contactless electronic means, on the one hand to save effort and on the other hand- (13) such a high switching control voltage on the other hand to reduce wear of frequently operated parts, to be feasible that both in normal and in avoid. inverse operation a sufficient base current in The invention is therefore based on a manual Passage direction flows. 30 microphone, the control part of which is a replacement for metallic ones Control contacts contactless electronic control module tel has, mi ', which handheld microphone is in at least one of the control positions AC voltages must be switched through, z. B. the Niederlire- The invention relates to a handheld microphone 35 quenzsignale to an electroacoustic transducer in for sound recording and playback devices, especially playback position. The invention consists in Their dictation machines, which contains a control part, with that for switching through the alternating voltages for which various control functions are provided in the main unit, the coector-emitter path of a transistor. can be triggered, e.g. B. the functions up-is, which is carried out by the assigned jointless electrical take, play, rewind and stop. 40 tronic means can be controlled conductive so far that he It is already known that these control functions, both in normal and in inverse operation, can be used to control the highest alternating voltage peaks that are to be carried out by one or more control slides, which in turn can be switched through to mechanical contacts for disconnection without being blocked,
would act of switching signals. With the invention, it is now possible for each control contacts to have only a limited service life In order to m any annoying counteracting position of the control part which is strong against the mechanical slide - if a shower is taking place during recording, because these control means also - to shamble AC voltage signals with a microphone capsule in a common. It is of course also possible to all console hand-held microphone housings are housed. tactless electronic control units of the control In order to equip these disadvantages of the mechanical control component in this way to both alternating cycles and to avoid control spool, it is already necessary to switch on voltages as well as direct voltages known (German Auslegeschrift 1282 089), to can. Place of mechanical control slide contactless 53 The control of the transistor for switching through electronic switching means for exercising the control of the alternating voltage signals is preferably carried out in functions to be provided. Such contactless elec- niche control means can, for. B. in the microphone-contactless electronic means such a high housing arranged capacitor plates, which can be supplied via switching control voltage that both in the hand capacity of the operator from the outside 60 normal as well as in inverse operation a sufficient are influenced and flows through an electronic chender base current in the forward direction. Switch perform the same switching function as before- The invention is based on a by a metallic contact. Embodiment also explained in more detail. It shows is it possible to use electrically wired cables to the outside? F i g. 1 shows the circuit diagram of a known microphone tending plates through the electrical transition 85 with metallic control contacts and resistance of the operator's hand with FIG. 2 shows the circuit diagram of the invention another conductive coating on the outside of the handheld microphone, connected to a main unit for To connect microphones and thereby an electro-sound recording and playback.